Answer:
Step-by-step explanation:
Step 1:
Write the expression
Step 2: Expand 
Step 3: Collect similar terms
Step 4: Factor 4 out of the expression to prove that the expression is a multiple of 4.
You can solve this question using two different methods. One is obviously a hit and trial method in which you keep guessing a number which gives the same amount of total cost. Second is forming two different equations and then solving them using simultaneous methods learnt.
The correct answer is 75 miles. I used the hit and trial method. You can see 20 + 75 * 0.35 = 46.25 and similarly 35 + 75 * 0.15 = 46.25. Hence the same cost.
Answer:
16.7
Step-by-step explanation:
We can use the Pythagorean theorem, a^2 + b^2 = c^2.
a = 11
c = 20
11^2 + b^2 = 20^2
121 + b^2 = 400
b^2 = 279
b = sqrt(279) = 16.7
It takes 3 minutes to fill 60L, so it takes 1 hour to fill 1200L.
